Air circulation refers to the movement or flow of air from one place to another. This can occur naturally through processes such as convection, where warm air rises and cooler air takes its place at lower levels, creating a cycle of rising and falling air masses that helps distribute heat around the planet. Human activities such as heating and cooling systems also create artificial air circulation by using fans or vents to move air through buildings and homes. The movement of air is important for many reasons including temperature regulation, distribution of pollutants, and overall comfort in indoor spaces.